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Suicide Rates Due to Depression Lower Than Thought

WebMD Health News

Dec. 7, 2000 -- While people who are being treated for depression are more likely to take their own lives than are the rest of the population, their rate of suicide is actually much lower than researchers have believed for the past 30 years, conclude the authors of a new study.

The researchers, from the Mayo Clinic in Rochester, Minn., also found that the risk of suicide is highest for people who have been hospitalized, and lowest for those treated in an outpatient setting, such as in a therapist's office. They also stress that while suicide is a rare event, most people who commit suicide have never received any mental health care.

Historically, psychiatrists and other mental health professionals have followed the findings of a 1970 study, which calculated that depressed people had a 15% chance of dying as a result of suicide during their lifetimes. Although this initial study referred only to people who had been hospitalized, the statistic was widely reported and eventually came to be applied to all people with depression. Another study published in 1990 drew the same conclusion.

But this rate seemed too high to John Michael Bostwick, MD, a consulting psychiatrist at the Mayo Clinic, so he decided to investigate further. Bostwick reviewed studies that reported suicide rates among people with depression, including both the 1970 and 1990 studies. He concluded that the method used to arrive at the 15% was incorrect, and applied a different strategy.

Bostwick also decided that the rate was inaccurate these days because the diagnosis of depression is applied far more broadly than it once was, and now includes people who are less severely ill.

Bostwick also tried to determine what would make the suicide rate higher or lower for patients with depression. What he found was an 8.6% chance of suicide among depressed persons who had been hospitalized after a suicide attempt or for suicidal thoughts; a 4% chance that depressed persons who had been hospitalized -- but not for suicidal behaviors -- would kill themselves; and only a 2% chance that someone with depression being treated as an outpatient would commit suicide at some point in their lives. The rate of suicide in the entire population is 1%.

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